Whether or not to dilute AMD and reduce heavy metal contamination in old mine tailings in order to safeguard water quality in Lefthand Creek provides an excellent example of the interface between scientific knowledge of a hazard and the factors that go into the ultimate policy decision regarding how to deal with that hazard. It provides a case study in the political, economic, ethical, and social dimensions that factor into that decision. Discuss briefly your perception of the appropriate role for earth science within the decision-making process in a situation such as this.